by National Industrial Conference Board. Tax Committee

1920

by National Lumber Manufacturers Association

1925

by National Education Association of the United States. Research Division

1923

by National Association of Wool Manufacturers

1922

by National Association of Wool Manufacturers

1917

by National Tax Association

1925

by National Association of Retail Druggists (U.S.)

1926

by United States. National Resources Committee

1938

by National Association of Cotton Manufacturers

1930

by National Electric Light Association

1929

by National Electric Light Association

1919

by United States. Congress. Temporary National Economic Committee

1940